SHOKAITEI!

(WAKATAKE-Class destroyer KURETAKE)

IJN Patrol Boat No. 46:
Tabular Record of Movement

© 2007-2015 Bob Hackett, Sander Kingsepp and Peter Cundall

Revision 6


15 May 1922:
Tokyo. Laid down at Ishikawajima shipyard as a WAKATAKE-Class destroyer and designated No. 22.

14 April 1923:
Launched and numbered D-12.

21 May 1924:
Completed. LtCdr (later Capt) Maruyama Yoshio (36) is the CO.

1 December 1925:
LtCdr Tokutomi Tadao (40) assumes command on paper. In reality, LtCdr Nakahara Tatsuhei (38)(the CO of KARUKAYA) assumes joint command of both vessels.

1 August 1928:
Renamed YUGAO.

1 November 1929:
Lt (Vice Admiral, posthumously) Aruga Kosaku (45) assumes command.

30 November 1929:
Lt Aruga is promoted LtCdr.

1 December 1930:
Lt (RAdm posthumously) Amaya Yoshishige (47) is appointed the CO.

15 January 1934:
LtCdr (Rear Admiral, posthumously) Isohisa Isogu (48) (former CO of W-5, W-13) assumes command.

15 November 1934:
An unknown officer assumes command.

1939:
One of three Kampon boilers is removed reducing speed to 18 knots. 25mm AA guns and depth charge racks and throwers are fitted for 60 DCs. Extra ballast is added to compensate for the loss of topside weight and to increase stability. The changes increase her displacement to 910-tons.

1 April 1940:
Reclassified as a special duty patrol boat and renumbered 46.

5 March 1941:
PB-46 becomes temporary flagship of the Kure Guard Unit.

8 March 1942:
Departs Sukumo on an anti submarine sweep with armed merchant cruiser KINJOSAN MARU, minelayer NASAMI and submarine chaser CH-13.

14 July 1942:
At 0800, arrives at Saeki with auxiliary cruisers SAIGON and BANGKOK MARUs and patrol boats PB-34 and PB-35.

21 August 1942:
At 1930 ammunition ship NICHIRO MARU steering southwards in 30N 132-35E area sights an enemy submarine and PB-46 is ordered to proceed to the area to assist.

5 September 1942:
PB-46 and PB-31 escort tanker NISSHIN MARU No. 2 north through the Bungo Straits.

E 6 September 1942:
The escorts are detached.

15 October 1942:
PB-46 departs Kure and escorts transport SUWA MARU south towards Rabaul.

October 1942:
At an unknowmn date PB-46 is detached.

29 November 1942:
PB-46 departs Moji escorting the “D” convoy (No. 8 Military Movement) consisting of KURAMASAN and KENKOKU MARUs.

30 November 1942:
Arrives at Saeki. Later that day, the convoy departs with minelayer NATSUSHIMA as an additional escort.

E 1 December 1942:
At 29N, the two escorts are detached.

7 December 1942:
PB-46 joins aircraft transport FUJIKAWA MARU off Fukajima and escorts her south.

E 8 December 1942:
PB-46 is detached S of the Bungo Straits.

9 December 1942:
PB-46 and subchasers CH-37 and CH-39 depart Saeki escorting the “G" convoy (No. 8 Military Movement) consisting of MOMOYAMA, HOEISAN, KOSO, TAIMEI, TOKO, ANNAN and BUNZAN MARUs.

E 10 December 1942:
CH 39 is detached at 28N.,

E 12 December 1942:
PB-46 and CH-37 are detached at 23N.

18 December 1942:
PB-46 and and minelayer YURIJIMA depart Saeki escorting the “O" convoy (No. 8 Military Movement) consisting of FUKUEI MARU No. 9, MADRAS, KAIFUKU, HORAI, ROKKOSAN, YUKI and NICHIAI MARUs.

E 19 December 1942:
The escorts are detached at 29N.

E 29 December 1942:
PB-46 joins naval tanker NARUTO off Fukajima and escorts her south.

30 December 1942:
PB-46 is detached 90 degrees off Toi Misaki.

January 1943:
Enters Kure Navy Yard for repairs.

13 February 1943:
Drydocked.

14 February 1943:
A fire breaks out at Kure Navy Yard, causing damage to PB-46 and torpedo boat HATO.

20 February 1943:
Undocked.

23 February 1943:
At 0800 departs Kure and at 1700 arrives at Motoura.

24 February 1943:
At 0900 departs Motoura and at 1700 arrives at Saiki.

25 February 1943:
At 2200 departs Saiki and patrols the Bungo Suido with CH-37.

28 February 1943:
At 1620 PB-46 and CH-37 arrive back at Saiki.

2 March 1943:
At 0800 PB-46 and subchaser CH-36 depart Saiki and join cargo transport KAGI MARU off Fukajima and escorts her south.

E 3 March 1943:
The escorts are detached 90 degrees off Toi Misaki. At 1100 arrives at Sukumo and departs there at 1800.

4 March 1943:
At 0700 arrives at Aburatsu and departs at 1800.

5 March 1943:
At 0800 PB 46 arrives at Saiki before at 2200 the ship and minelayer NASAMI departs Saiki escorting the “F2” convoy (No. 8 Military Movement) consisting of YOSHIDA MARU No. 3, KIYO and SATSUMA MARUs.

E 7 March 1943:
The escorts are detached at 28-30N.

8 March 1943:
PB-46 and minelayer NASAMI join tanker ITSUKUSHIMA MARU at 29-33N, 132-3E and escort her to 135E.

9 March 1943:
At 1200 PB-46 arrives briefly at Sukumo before departing port at 1500.

11 March 1943:
At 1015 PB-46 again arrives briefly at Sukumo before departing at 1600. Then PB-46, PB-31, torpedo boat HATO, minelayer NUWAJIMA and subchaser CH-36 escort battleship HARUNA from Osumi Kaikyo to Okinoshima.

13 March 1943:
At 0830 arrives at Saiki.

14 March 1943:
At 0030 PB-46 and torpedo boat HATO depart Saiki escorting the “G2” convoy (No. 8 Military Movement) consisting of TEIKAI (ex German FULDA), TSUYAMA, TAIRIN and ATLAS MARUs.

16 March 1943:
The escorts are detached from the convoy at 28-30N and join cargo ship NIPPO MARU and head north.

E 17 March 1943:
The escorts are detached off Fukajima. Soon after at 1420 PB-46 arrives at Saiki.

19 March 1943:
At 0720 departs Saiki escorting auxiliary submarine tender YASUKUNI MARU which is headed south.

20 March 1943:
At 0820 PB-46 arrives at Sukumo. At 1500 PB-46, minelayers NATSUSHIMA and NUWAJIMA and torpedo boat HATO escort battleship HARUNA, aircraft carriers SHOKAKU and RYUHO and their escorting destroyers to Okinoshima.

21 March 1943:
At 1130 arrives at Saiki.

22 March 1943:
At 1500 departs Saiki.

23 March 1943:
At 0830 arrives at Shibushi and departs there at 1600.

24 March 1943:
At 1030 arrives at Saiki.

25 March 1943:
At 1100 departs Saiki with torpedo boat HATO escorting Army landing craft depot ship MAYASAN MARU

E 26 March 1943:
PB-46 is detached at 30N. At 1600 arrives back at Saiki.

27 March 1943:
At 1700 departs Saiki.

28 March 1943:
At 1830 arrives back at Saiki. At 2300 PB-46 and minelayer YURIJIMA depart Saiki escorting the “K2” convoy (No. 8 Military Movement) consisting of YONEYAMA, SHUNSHO, and SHINTO MARUs.

E 29 March 1943:
The escort is detached at 29N.

30 March 1943:
PB-46 joins storeship IRAKO at 29-05N, 134-04E and escorts her north through the Bungo Straits.

E 31 March 1943:
PB-46 is detached off Fukajima. At 1730 arrives at Saiki.

1 April 1943:
At 0900 departs Saiki.

2 April 1943:
Arrives at Kure.

12 April 1943:
At 0900 departs Kure. At 1620 arrives at Saiki.

13 April 1943:
At 1000 PB-46 and torpedo boat HATO depart Saiki escorting convoy K-413 consisting of SORACHI, HAMBURG, HIMALAYA, IKOMA, TAIFUKU and YOSHINO MARUs.

E 14 April 1943:
PB 46 is detached at 29N.

15 April 1943:
At 1440 PB-46 arrives back at Saiki.

20 April 1943:
At 0600, PB-46 and minelayer YURIJIMA depart Saeki escorting convoy No. 420 consisting of ONOE, KINKASAN, and KOYU MARUs.

E 21 April 1943:
YURIJIMA is detached at 29N.

28 April 1943:
At 1440, arrives at Palau.

2 May 1943:
At 0650, departs Palau escorting convoy No. P-502 consisting of MITAKESAN, MYOKO, MUKO, NISSHO, SHICHISEI and MYOGI MARUs.

9 May 1943:
About noon, auxiliary minesweeper TAKUNAN MARU No. 3 joins the escort.

10 May 1943:
At 1145, arrives at Saiki.

11 May 1943:
At 0730 departs Saiki but soon after, at 1225, returns to Saiki.

13 May 1943:
At 1030 departs Saiki.

14 May 1943:
PB-46 joins IJA landing craft depot ship NIGITSU MARU at 27-27N, 134-05E and escorts her north.

15 May 1943:
PB-46 is detached off Fukajima and later at 1420 arrives at Saiki.

17 May 1943:
At 1300 departs Saiki.

18 May 1943:
PB-46 joins tanker KOKUYO MARU at 30-38N, 131-46E and escorts her to Saiki, arriving at 2210.

24 May 1943:
At 0645 departs Saeki escorting IJA Landing craft depot ship NIGITSU MARU south. PB-46 is detached at 29N and returns briefly to Saiki, arriving at 1900.

25 May 1943:
At 1140 departs Saiki and joins seaplane carrier NISSHIN off Fukajima and, with two unidentified auxiliary subchasers, escorts her south.

26 May 1943:
PB-46 and the auxiliary subchasers are detached off Ashizuri Zaki. PB-46 and minesweeper W-31 join convoy P-523 at 29-50N, 132-02E consisting of TEIRYU (ex German AUGSBURG), CHINZEI, FUKKO, TOYO, KACHOSAN and ARATAMA MARUs being escorted by minelayer NUWAJIMA. At 1720 arrives back at Saiki.

30 May 1943:
At 1200 departs Saiki.

31 May 1943:
At 1120 arrives at Furue. At 1830 departs Furue.

2 June 1943:
At 0800, PB-46 and minesweeper W-18 depart Saiki escorting convoy O-204 for Palau consisting of GENOA, SEIZAN, SHICHISEI and KEIZAN MARUs.

E 3 June 1943:
W-18 is detached at 29N.

11 June 1943:
NW of Palau. At about 0950, in squall conditions, LtCdr (later Vice Admiral) John A. Tyree’s (USNA ’33) USS FINBACK (SS-230) attacks the convoy. Tyree fires three torpedoes and gets at least one hit in GENOA MARU’s forward in No. 1 hold. PB-46 counterattacks, but fails to inflict damage, and USS FINBACK escapes. GENOA MARU continues to progressively flood forward until 1730, when Abandon Ship is ordered. At 1851, she sinks by the bow at 07-35N, 134-28E. The ship was loaded with 9300 cartons of foodstuffs, clothes, weapons and two passengers, one of whom was killed. Auxiliary minesweeper TAMAZONO MARU No. 3 which arrived at 1458 assists in patrols and lifesaving. At 1158, the remainder of convoy O-204 arrives at Palau.

12 June 1943:
At 0800 departs Palau but returns at 1000.

15 June 1943:
At 1200 departs Palau.

17 June 1943:
At 1430 arrives back at Palau.

19 June 1943:
At 0545, departs Palau in convoy To-906 consisting of DELAGOA, DAINICHI, KAZAN, MACASSAR, SAN FRANCISCO MARUs and EIKO MARU No. 2, escorted by PB-46 and minesweeper W-17.

E 20 June 1943:
At latitude 10N, W-17 is detached and returns to Palau.

E 27 June 1943:
Minelayers YURIJIMA and NUWAJIMA join as additional escorts at 30-40N 134-50E,

28 June 1943:
At 1920, arrives at Saiki.

29 June 1943:
At 0925 departs Kure and at 1620 arrives at Kure.

5 July 1943:
At 1000 departs Kure and at 1630 arrives at Saiki.

8 July 1943:
At 0545 PB-46, minesweeper W-18 and auxiliary gunboat HINO MARU No. 5 depart Saiki escorting convoy O-806 convoy consisting of fleet supply ship ARASAKI and ASO, EHIME, KAZAN and ZUISHO MARUs bound for Palau.

E 9 July 1943:
W-18 is detached at 29N.

16 July 1943:
At 1200, the convoy, except straggler KAZAN MARU, arrives at Palau.

17 July 1943:
At 1620 PB-46, presumably escorting KAZAN MARU, arrives at Palau.

20 July 1943:
At 1200, PB-46 departs Palau with minesweeper W-17 escorting convoy FU-006 consisting of ERIE, KINKASAN, KENZAN, NISSHU, KAMO and INARI MARUs.

E 21 July 1943:
At 10N, W-17 and probably PB-46 are detached to return to Palau.

24 July 1943:
At 1200 arrives at Palau.

25 July 1943:
At 1345, PB-46 departs Palau escorting convoy FU-506 consisting of MATSUE (SHOKO), HIBI, KOYU, YURI, KOFUKU and MUKO MARUs.

E 31 July 1943:
Minelayer YURIJIMA and auxiliary minesweeper TAKUNAN MARU No. 3 join the convoy at 28-25N, 136-40E.

2 August 1943:
At 1800, arrives at Saiki.

3 August 1943:
At 0700 departs Saiki and at 1450 arrives at Kure.

11 August 1943:
At 0630 departs Kure and at 1200 arrives at Saiki.

12 August 1943:
At 0730, PB-46 departs Saiki for Palau with subchaser CH-11, auxiliary minesweepers TAMA MARU and TAKUNAN MARU No. 3 escorting convoy O-208 consisting of HIBI, MATSUE (SHOKO), YASUKUNI, MOJI, FUKKAI, YASUSHIMA, SHICHISEI and UMEKAWA MARUs. At latitude 29N, TAKUNAN MARU and TAMA MARU No. 3 are detached to return to Saeki.

21 August 1943:
At 1320, arrives at Palau.

24 August 1943:
At 0700, PB-46 departs Palau for Ujina with auxiliary gunboat KAZAN MARU escorting convoy FU-407 consisting of empty troop ships BRAZIL, FUKKO, HAVRE, YAMATO, TOHO and MINRYO MARUS. LtCdr (later Cdr) John A. Scott's (USNA ’28) USS TUNNY (SS-282) makes several attacks on the convoy, but is unsuccessful, probably due to defective Mark 14 torpedoes of which Scott fires 11. USS TUNNY is depth charged, damaged and after a fire breaks out aboard, forced to abort her war patrol.

E 2 September 1943:
Auxiliary gunboat CHOUN MARU, auxiliary netlayer TAISHU MARU, auxiliary minesweepers TAKUNAN MARU No. 3 and TAKUNAN MARU No. 8 and auxiliary patrol boats TAITON MARU and NITTO MARU No. 12 join the convoy at 29-41N, 133-16E

3 September 1943:
Arrives at Fukashima, then departs.

4 September 1943:
Arrives at Ujina then Kure. Docked for maintenance.

22 September 1943:
At 0800 departs Kure.

23 September 1943:
At 0700 arrives at Kobe.

24 September 1943:
At 1600 departs Kobe escorting an unknown convoy.

25 September 1943:
At 1600 arrives at Yokosuka.

28 September 1943:
At 0600 PB-46 departs Yokosuka with the destroyer UMIKAZE and auxiliary submarine chasers CHa-25 and CHa-27 escorting convoy No. 3928 consisting of SANSEI MARU and PARAN MARU (ex Philippine PALAWAN).

4 October 1943:
Arrives at Chichijima.

8 October 1943:
Departs Chichi Jima escorting SANSEI MARU.

14 October 1943:
Arrives at Minami Torishima.

17 October 1943:
The ships depart Minami Torishima.

21 October 1943:
Arrives back at Chichi Jima.

24 October 1943:
Departs Chichi Jima escorting a convoy consisting of SANSEI MARU, UNKAI MARU No. 10 and possibly others.

29 October 1943:
Arrives back at Yokosuka. Undergoes repairs.

5 November 1943:
Departs Yokosuka escorting a convoy.

8 November 1943:
Arrives at Kobe.

10 November 1943:
PB-46 departs Kobe escorting convoy No. 8110A consisting of four unidentified merchant ships bound for Tokyo. The convoy sails at 8 knots.

12 November 1943:
Arrives at Yokosuka.

14 November 1943:
At 1200, convoy No. 4114 consisting of UDO, NIKKO, CHIYO and HOKKO MARUs escorted by destroyer YUZUKI, kaibokan FUKUE departs Truk. HOKKO MARU is towing damaged subchaser CH-10. At some unknown point PB-46 joins the escort.

16 November 1943:
PB-46 departs Yokosuka to join the convoy.

19 November 1943:
NE of Asuncion Island, Northern Marianas. In the early morning hours, Cdr (MOH, posthumously) Samuel Dealey's (USNA ’30) USS HARDER (SS-257) makes radar contact off the port quarter of the convoy. Dealey attempts to contact two other boats of his wolfpack, USS PARGO (SS-264) and USS SNOOK (SS-279), but all radio frequencies are jammed by the Japanese. Dealey makes an "end-around" then submerges 15,000 yards ahead of the convoy. USS HARDER is detected by YUZUKI’s sonar before Dealey's crew can work out a good solution and Dealey has to snap-shoot to avoid being rammed by one of the transports. At 0415 (JST), 5,384-ton HOKKO MARU is hit. At 0435, she sinks at 22-27N, 147-15E. Of the approximately 640 passengers and troops on board, one trooper together with three crewmen are killed. Dealey swings USS HARDER around and fires his four stern tubes. At 0435, UDO MARU is hit and badly damaged. Five crewmen are KIA. [2]

YUZUKI takes UDO MARU in tow, but at 1040, the transport's hull splits and the aft part of the ship sinks. CHIYO MARU takes up towing CH-10 and heads for Chichi-Jima with FUKUE. Later, NIKKO MARU is ordered back to assist in the tow of UDO MARU. At 1850, NIKKO MARU arrives back on the scene, but experiences great difficulty trying to tow UDO MARU. Finally, the wreck is abandoned and sinks a few hours later.

The escorts counterattack and drive USS HARDER deep under a thermocline layer of colder water. Dealey's crew counts 64 depth depth charges dropped over the next five hours during which time they reload all tubes. USS HARDER surfaces early in the afternoon and takes up the chase again. That night, Dealey closes to within 1,000 yards of the convoy. He fires four Mark 14-3A steam torpedoes at a transport, but they all run deep and pass under the target. Dealey makes another end-around and submerges 12,000 yards ahead of the convoy. He sets up and at 2355, fires three bow torpedoes and gets two hits, one amidships and another in NIKKO MARU's stern.

Later that day PB-46 arrives at Chichi Jima, inferring she missed the above action.

20 November 1943:
The Japanese get all NIKKO MARU's pumps running and efficiently control the flooding. In the early morning hours, USS HARDER fires five more torpedoes at her, but all miss. NIKKO MARU maneuvers so that she can comb the wake before the third one is fired. The last torpedo makes a circular run, forcing USS HARDER to submerge to prevent her being hit.

Dealey attempts to battle-surface on NIKKO MARU, but the merchant finds the range first and straddles USS HARDER, forcing her down again. Out of torpedoes a frustrated Sam Dealey departs the area, but later, NIKKO MARU loses her battle with the sea and sinks. 15 crewmen have been killed.

USN codebreakers intercept and decrypt a message from the captain of Patrol Boat PB-46 that reads:“At 0900, HOKKO MARU sank in position 23-42 N, 140- (?) E.”

At 1540, USN codebreakers intercept and decrypt a message from an unknown station that says, “YUZUKI will proceed to Yokosuka and undergo repairs.”

The surviving members of the convoy arrive at Chichi Jima.

21 November 1943:
The convoy, with PB-46 as an additional escort, departs Chichi Jima. It seems probable that PB-46 detached and returned to the disaster site to look for survivors, and did not rejoin the convoy.

27 November 1943:
The decimated convoy arrives at Yokosuka.

2 December 1943:
At 0600, PB-46 departs Chichi-Jima for Yokosuka with minesweeper W-28 escorting a convoy consisting of SANKISAN and HINODE MARUs.

4 December 1943:
Tokyo Bay. Arrives at Tateyama.

5-6 December 1943:
At 2350, departs Tateyama. Arrives at Yokosuka.

11 December 1943:
At 1000, PB-46 departs Yokosuka with kaibokan OKI and subchaser CH-31 escorting convoy No. 3211A consisting of transports SHINYO, MITAKESAN and HAKOZAKI MARUs.

14 December 1943:
HAKOZAKI MARU is detached for Chichi-Jima with engine trouble, together with SHINYO MARU, both accompanied by PB-46.

18 December 1943:
HAKOZAKI MARU departs Chichi-Jima escorted by PB-46.

20 December 1943:
At 0800, the main convoy arrives at Truk.

22 December 1943:
While escorting transport HAKOZAKI MARU from Chichi-Jima, a torpedo attack occurs at 09-40N, 145-51E. In avoiding torpedoes, HAKOZAKI MARU causes PB-46 to collide with her, damaging the vessel’s bow with concave damage to foc'sle outer plate. [3]

24 December 1943:
HAKOZAKI MARU and PB-46 arrive at Truk.

27 December 1943:
At 0535 PB-46 and Coast Defence Ship OKI departs Truk escorting convoy No. 4227 consisting only of ammunition carrier KOGYO MARU.

2 January 1944:
Arrives Chichi-Jima and departs later that day.

5 January 1944:
Arrives at Yokosuka.

Early January 1944:
Yokohama. PB-46 probably undergoes repairs to her bow.

10 January 1944:
At 0700, departs Yokohama for Owase with SAISHU MARU No. 6 and SAISHU MARU No. 7 escorting convoy No. 7110 consisting of KOGYO, MISHIMA, TAIRYU MARUs and an unidentified freighter.

12 January 1944:
S of Daio Zaki, Honshu. At about 2300, LtCdr (later Rear Admiral) William B. Sieglaff's (USNA ’31) USS TAUTOG (SS-199) attacks the convoy at 34-10N, 136-55E. Sieglaff torpedoes and damages ammunition carrier KOGYO MARU that takes on a list to port. The Ise Bay Guard Unit dispatches several subchasers including BANSHU MARU No. 18 and TAKACHIHO MARU to the area to intercept the submarine.

13 January 1944:
After 0003, PB-46 conducts a depth-charge attack against an underwater target., At 0250, the Ise Bay Guard Unit dispatches auxiliary mine sweeper BANSHU MARU No. 18 to the area to intercept the submarine. At 0530, PB-46 takes KOGYO MARU under tow.

14 January 1944:
Returns to Owase Bay.

16 January 1944:
Arrives at Toba.

17 January 1944:
Departs Toba. Undertakes a convoy escort mission then a prolonged submarine sweep.

28 January 1944:
Arrives back at Toba.

31 January 1944:
Departs Toba on a convoy escort mission with auxiliary minesweeper SONOBE MARU and torpedo boat CHIDORI escorting convoy No. 8129 consisting of KENAN MARU and two unidentified ships. Later that day USS PLUNGER unsuccessfully attacks the convoy and the Ise Bay Guard Unit despatchhes several subchasers to find and sink the submarine.

Throughout February undertakes convoy escort and submarine sweep missions.

29 February 1944:
Arrives at Toba.

4 March 1944:
Departs Toba. Throughout March undertakes convoy escort and submarine sweep missions.

2 April 1944:
At 0500 PB-46 departs Toba with convoy No. 8331 consisting of KASHIMASAN MARU and three unidentified merchant ships.

4 April 1944:
Arrives Yokkaichi and departs later that day. Late that day arrives at Toba.

5 April 1944:
Departs Toba.

6 April 1944:
Undertakes rescue operations of tanker MARIFU MARU that is reportedly in distress.

7 April 1944:
Arrives at Toba.

9 April 1944:
Departs Toba on an escort mission.

10 April 1944:
Returns to Toba.

12 April 1944:
Departs Toba and later that day arrives at Nagoya where the ship is drydocked until late May.

20 May 1944:
PB-46 is reassigned to the Yokosuka Naval District’s 3rd Surface Escort Division.

22 May 1944:
At 1000 undocked.

23 May 1944:
Departs Nagoya.

24 May 1944:
Arrives at Toba.

25 May 1944:
Departs Toba on an escort mission.

26 May 1944:
Escorts convoy No. 7526 consisting of an unknown number of unidentified ships.

30 May 1944:
Arrives back at Toba.

2 June 1944:
Departs Toba.

8 June 1944:
PB-46 departs Inland Sea escorting convoy No. 7608A consisting of one unidentified merchant ship. The convoy sails at 11.5 knots.

13 June 1944:
PB-46 and submarine chaser CH-14 depart Tateyama escorting auxiliary cruiser GOKOKU MARU. Later that day arrives at Owase.

30 June 1944:
Arrives at Toba.

3 July 1944:
At 2330 departs Toba escorting convoy 7702A consisting of one unidentified merchant ship.

4 July 1944:
Arrives back at Toba.

6 July 1944:
At 0600 from off Toba, PB-46 escorts convoys No. 8704A and No. 8704B consisting of three and two unidentified merchant ships respectively sailing from the Inland Sea to Tokyo Bay. 8704A sails at 9 knots and 8704B at 8 knots. After this PB-46 undertakes a submarine sweep.

9 July 1944:
Arrives back at Toba.

10 July 1944:
From off Toba, PB-46 escorts AWA MARU the sole member of convoy No. 7710 bound from Tokyo Bay to Inland Sea at 14.5 knots.

14 July 1944:
At 0840 from off Toba, PB-46 escorts westbound convoy No.7712B consisting of two unidentified merchant ships part way to Inland Sea. The convoy sails at 7 knots.

E 15 July 1944:
At PB-46 meets up with eastbound convoy No. 8713 consisting of three unidentified merchant ships escorted by auxiliary patrol boat KOGYO MARU No. 12. The ships sail at 9 knots.

17 July 1944:
At 2300 meets up with convoy No. 7715 consisting of two unidentified merchant ships.

19 July 1944:
Arrives back at Toba.

21 July 1944:
At 0530 departs Toba escorting a convoy.

22 July 1944:
At 0530 meets up with another convoy.

23 July 1944:
Arrives at Shimoda.

25 July 1944:
At 0340 departs Shimoda escorting convoy No. 7724 consisting of one unidentified merchant ship.

26 July 1944:
PB-46 transfers to escorting convoy No. 7726A then escorted by auxiliary patrol boats CHIKYU and KEISHO MARUs consisting of one unidentified merchant ship. The ship then undertakes a sweep for enemy submarines.

28 July 1944:
Arrives at Toba.

1 August 1944:
At 1230 departs Toba escorting seaplane tender AKITSUSHIMA.

3 August 1944:
Arrives back at Toba.

9 August 1944:
Departs Toba to assist TOYOKAWA MARU, reportedly in distress.

11 August 1944:
At 0544 detects and attacks an enemy submarine.

12 August 1944:
At 1745 arrives at Toba.

13 August 1944:
PB-46 departs Toba and meets up and escorts transport HAKOZAKI MARU east. The ships sail at 12.5 knots. Late that day arrive at Gobo anchorage.

14 August 1944:
The ships depart Gobo anchorage and later that day arrive at Tateyama.

16 August 1944:
PB-46 calls at Yokkaichi for bunkers.

17 August 1944:
Arrives at Toba.

23 August 1944:
At 0515 departs Toba escorting convoy No. 8822A consisting of an unknown number of unidentified merchant ships. Then undertakes a submarine sweep before escorting another convoy.

2 September 1944:
At 0730 departs Toba and escorts tanker HOEI MARU No. 8. Later escorts tanker SARAWAK MARU sailing from Kobe to Yokohama and patrolling.

3 September 1944:
SARAWAK MARU arrives at Yokohama.

5 September 1944:
Arrives at Toba.

7 September 1944:
At 0505 departs Toba.

8-11 September 1944:
On escort missions and patrolling. Briefly escorts eastbound convoys No. 8910 consisting of two unidentified merchant ships sailing at 5 knots and No. 8911 consisting of four unidentified merchant ships.

12 September 1944:
Arrives back at Toba.

14-17 September 1944:
At 0700 departs Toba. On an escort mission escorting HAKOZAKI MARU, the sole member of convoy No. 8915 with auxiliary patrol boats KEISHO and TAKACHIHO MARUs and patrolling.

18 September 1944:
Arrives at Shimizu.

19 September 1944:
Departs Shimizu. Meets up and escorts NANJIN MARU and then HISHI MARU and IBUKI MARUs, the latter two sailing westward together. Finally escorts convoy No. 8915 apparently consisting of tanker TOSEI MARU No. 1.

23 September 1944:
Arrives at Toba.

11-12 October 1944:
Departs Toba and undertakes a sub sweep and then an escort mission escorting first tanker SEISHIN MARU and then RASHU MARU.

13 October 1944:
Arrives back at Toba.

19-23 October 1944:
Undertakes a sub sweep and then an escort mission escorting 2A cargo ship JINTSUGAWA MARU eastward towards Tokyo Bay with auxiliary minesweeper SHOWA MARU No. 7. The ships sail at 5 knots. Later meets up with eastbound convoy No. 8018 consisting of six unidentified merchant ships bound for Tokyo Bay. Then escorts TAISEI MARU westward before arriving back at Toba.

31 October 1944:
Departs Toba and undertakes an escort mission escorting KOSHU MARU. Remains at sea on patrols and conducting escort missions until sunk.

1 November 1944:
Convoy No. 7101 departs Tokyo Bay for the Inland Sea. At some unknown point PB-46 joins the escort, together with auxiliary patrol boats NIPPON MARU No. 2 GO and KAZUMI MARU and auxiliary minelayer TAKACHIHO MARU, the latter three in the Ise Wan area.

2 November 1944:
Convoy No. 8030 consisting of two unidentified merchant ships bound for Tokyo Bay leaves Kobe. The convoy steams at 7 knots. At some unknown point the escort is joined by PB-46 and auxiliary patrol boat CHIKUZEN MARU off Ise Wan. Soon after PB-46 is detached and briefly escorts convoy No. 7102

3 November 1944:
Convoy No. 7103 consisting of five unidentified merchant ships departs Tokyo Bay for the Inland Sea. The convoy sails at 7 knots. At some unknown point PB-46 joins the escort as well as auxiliary minelayer Wa-18 and auxiliary patrol boat KOGYO MARU No. 12 (the latter off Ise Wan). Still later auxilary patrol boat CHIKUZEN MARU and auxiliary submarine chaser CHa-182 join.

4 November 1944:
Arrives back at Toba.

5 November 1944:
Departs Toba. PB-46 and auxiliary patrol boats KOGYO MARU No. 12, NIPPON MARU No. 2 GO, KAZUMI MARU and at a later stage CHIKUZEN MARU join up with combined convoy No. 8102 consisting of four unidentified merchant ships originally escorted by cable layer escort HATSUSHIMA (detached at Yuranai) and convoy No. 8104 consisting of four unidentified merchant ships.

6 November 1944:
Arrives back at Toba.

7 November 1944:
Coastal tanker HOZAN MARU No. 2 GO departs Tokyo Bay for Inland Sea and is at some point escorted by PB-46 that departs Toba during the day. Later auxilary patrol boat CHIKUZEN MARU takes over off Ise Wan. At 2200 PB-46 again departs Toba to meet up with tanker KAMOI.

8 November 1944:
PB-46 begins escorting KAMOI and at 1600 arrives at Shimizu.

9 November 1944:
At 1700 departs Shimizu.

10 November 1944:
At 0700 PB-46 meets up with convoy No. 8110 consisting of 2AT tanker SHINYU MARU and four unidentified merchant ships (the latter may have already detached before the attack below).

SW of Cape Iro (Iro Zaki). At 0845 (I), LtCdr John D. Gerwick’s (USNA ’35) USS GREENLING (SS-213) sights a medium sized tanker (SHINYU MARU) escorted by what he correctly identifies as a WAKATAKE-Class destroyer crossing Suruga Bay heading west. A 0853 (I), two medium bombers are sighted over the target area.

Gerwick swings USS GREENLING hard left to bring his stern tubes to bear and at 0939 (I) fires four Mark-18 electric torpedoes at the "destroyer" and gets one hit that sinks PB-46 at 34-30N, 138-34E. The planes drop six bombs, but USS GREENLING escapes.

10 January 1945:
Removed from the Navy List.


Author's Notes:
[1] The various convoys of the No. 8 Military Movement were enroute to Saipan, Carolines.

[2] Some of USS HARDER's "hits" may have actually been duds.

[3] The unsuccessful torpedo attack probably was made by LtCdr Michael P. Russillo's USS MUSKALUNGE (SS-262).

Thanks to Mr. Gilbert Casse of France for general assistance with revision 4.

-Bob Hackett, Sander Kingsepp and Peter Cundall


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